Exercises 6.1 Consider the following universal relation that holds info about the inventory of books in a bookstore: Books (title, isbn, author, publisherName, publisherAdd, totalCopiesOrdered, copiesInStock, publication Date, category sellingPrice, cost) Assume - The isbn uniquely identifies a book. (It does not identify each copy of the book, however.) A book may have more than one author. An author may have more than one book. . . Each publisher name is unique. Each publisher has one unique . Titles are not unique. . totalCopiesOrdered is the number of copies of a particular address-the address of the firm's national headquarters. book that the bookstore has ever ordered, while copiesInSto is the number still unsold in the bookstore. Exercises 6.1 Consider the following universal relation that holds info about the inventory of books in a bookstore: Books (title, isbn, author, publisherName, publisherAdd, totalCopiesOrdered, copiesInStock, publication Date, category sellingPrice, cost) Assume - The isbn uniquely identifies a book. (It does not identify each copy of the book, however.) A book may have more than one author. An author may have more than one book. . . Each publisher name is unique. Each publisher has one unique . Titles are not unique. . totalCopiesOrdered is the number of copies of a particular address-the address of the firm's national headquarters. book that the bookstore has ever ordered, while copiesInSto is the number still unsold in the bookstore